diff --git a/demux/cache.c b/demux/cache.c
index dc0e91b74a..6398f61823 100644
--- a/demux/cache.c
+++ b/demux/cache.c
@@ -215,7 +215,7 @@ int64_t demux_cache_write(struct demux_cache *cache, struct demux_packet *dp)
     }
 
     assert(!dp->is_cached);
-    assert(dp->len >= 0 && dp->len <= INT32_MAX);
+    assert(dp->len <= INT32_MAX);
     assert(dp->avpacket->flags >= 0 && dp->avpacket->flags <= INT32_MAX);
     assert(dp->avpacket->side_data_elems >= 0 &&
            dp->avpacket->side_data_elems <= INT32_MAX);
@@ -261,7 +261,7 @@ int64_t demux_cache_write(struct demux_cache *cache, struct demux_packet *dp)
     for (int n = 0; n < dp->avpacket->side_data_elems; n++) {
         AVPacketSideData *sd = &dp->avpacket->side_data[n];
 
-        assert(sd->size >= 0 && sd->size <= INT32_MAX);
+        assert(sd->size <= INT32_MAX);
         assert(sd->type >= 0 && sd->type <= INT32_MAX);
 
         struct sd_header sd_hd = {
@@ -294,9 +294,6 @@ struct demux_packet *demux_cache_read(struct demux_cache *cache, uint64_t pos)
     if (!read_raw(cache, &hd, sizeof(hd)))
         return NULL;
 
-    if (hd.data_len >= (size_t)-1)
-        return NULL;
-
     struct demux_packet *dp = new_demux_packet(hd.data_len);
     if (!dp)
         goto fail;